Holding device for sawmill carriages



1 3 1,622,059 March 927 R. w. STOCKEMER Y noupme DEVICE FOR swam, CARRIAGES I Filed May 8,-1926 2 Sheets-Sheet 1' wwemtoz j. WJZwZJgkM/ I 1,622,059 March 1927' R. w. STQCKEMER HOLDING DEVICE FOR SAW MILL CARRIAGES Filed May 8, 1925 2 Sheets-Sheet 2 z I o anm o Patented Mar. 22, 1927.

1 UNITED STATES RALPH W. STOCKEMER,

or DIEBKS, ARKANSAS.

HOLDING DEVICE FUR SAWMILL CARRIAGES.

Application filed May 8,

This invention relates to a holding device for use in connection'with the carriages of saw mills whereby a carriage can be held against accidental movement. 7

It has frequently happened that, while repairs are being made to the carriage of a saw mill, the carriage has started accidentally with the result that many fatal accidents have occurred. The starting of the carriage has been due to many causes such as leakage of steam through the feed valves, dis placement of a connecting pin of the valve, dropping of an object on the valve connection, etc.

It is an object of the present invention to provide holding means which can be combined readily with a saw mill carriage of the usual type, said holding means being arranged to secure the carriage at either limit of its movement until it is safe to operate the same.

With the foregoing and other objects in View which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings the pre ferred form of the invention has been shown.

In said drawings,

Figure 1 is a plan view of a saw mill carriage having the present improvements combined therewith, portions of the carriage and its track being broken away.

Figure 2 is a bottom plan View of the structure shown in Figure 1.

Figure 3 is an enlarged section through one end portion of the carriage and showing a portion of the holding means.

Figure 4: is a section on line l l, Figure 3.

Figure 5 is a section on line 55, Figure 1.

Referring to the figures by characters of reference 1 designates the track on which the saw mill carriage 2 is mounted to travel. Cross beams 3 are provided at the ends of the track for limiting the movement of the carriage and each of these cross beams is preferably provided with a resilient bumper ft adapted to be contacted by the carriage as it approaches either extreme position.

1926. Serial No. 107,735.

The parts thus far describedd-o not, in themselves, constitute any part of the present invention but are already in use.

For the purpose of holding the carriage against movement away from either extreme position, there is provided on each cross beam or member 3 a bracket 5 in which is pivotally mounted a lever 6 one end of which is formd with ratchet teeth 7. A yoke 8' straddles this lever and has a spring 9 therein bearing downwardly thereagainst. The compression of this spring can be regulated by means of a screw 10 mounted in the upper portion of the yoke. 1

Journaled under the frame 11 which supports the track is a transverse shaft 12 provided with a radial arm 13 connected by a rod 14 to the lever 6 thereabove. This rod may be made of sections connected by a turnbuckle 15 so as to be adjustable in length. Another arm 16 is extended downwardly from the shaft 12.

The construction and arrangement of lever 6, shaft 12, and the parts cooperating therewith, is duplicated at the respective ends of thetrack and both of the depending arms 16 are connected by rods 17 to the respective oppositely extended arms of a T- lever 18 fulcrumed under the frame 11 at any suitable point between the ends of the track. The intermediate arm 19 of the T- lever, which is extended at right angles to the other arms of the lever has a rod 20 extending laterally therefrom and connected to the depending arm of a bell crank 21 fulcrumed on one side of the frame 11 as shown at 22. The upper arm of this bell crank may be connected in any suitable manner to a foot pedal 23. For example a rod 24 may be extended from one end of this pedal to the upper arm of the bell crank as shown particularly in Figure 5.

Secured to each end portion of the carriage 2 are cross plates 25 each of which has an upstanding longitudinal rib 26. Each rib is so shaped that, when engaged by one of the ratchet teeth 7, the carriage will be held against movement away from the ad jacent bumper.

In practice the levers 6 are held in raised positions by pressing on the pedal 23 so that motion will thus be transmitted through bell crank 21, rod 20 and the T-lever 18 to the rod 17 which, in turn, will pull upon the arms 16 and cause rod 14: and lever 6 to move upwardly against the action of the spring 17 Vhile the parts are thus held the carriage 2 will be free to travel back and forth.

When it is desired to hold the carriage against movement so that repairs can be made. the pedal. 28 is released. and the springs 9 will force levers 6 downwardly so that when the carriage is moved toward either bumper, the ribs 26 on the advancing end thereof will come against and slip under the ratchet teeth 7 and tinally be engaged by one of these teeth so that the carriage will be held against return movement. This is of course done after the power has been cut oii. Consequently should there be any leakage of steam or should the power he applied accidentally, the engaged lever would hold the carriage against movement and danger of injury to the workmen will thus be eliminated.

It will be noted of course that the carriage will be held by this mechanism when in either extreme position.

What is claimed is:

1. The combination with a saw mill carriage and a track therefor, of means for limiting the movement of the carriage along the track, cooperating means adjacent thereto and upon the carriage for holding said carriage against movement away from either extreme position thereof, and means operable from a point between the terminals of the path of movement of the carriage for simultaneously actuating the holding means to release the carriage when in either extreme: position.

2. The combination with a saw mill carriage and a track therefor, of means for limiting the movement of the carriage in either direction along the track, a yieldingly restrained ratchet member, means on the carriage for engagement therewith to hold the carriage against return movement, and means remote from the carriage and track for shifting the ratchet member to release the held carriage.

3. The combination with a sawmill carriage and a track therefor, ot ratchet levers movably mounted adjacent the ends of the path of movement of the carriage, means on the carriage for engaging the ratchet levers when the carriage arrives at the respective limits of its movement, yielding means engaging the levers for holding them normally in the path of the engaging means on the carriage, a connection between the ratchet levers to insure sin'iultaneous move ment thereof into or out of engaging position, and .means under the control of the operator for shifting said connection to operate the levers.

i. The combination with a saw mill carriage and a track for supporting the same. and ,bumpers for limiting the movement of the carriage along the track, of oppositely disposed ratchet levers pivotally mounted adjacentthe respective bumpers, yielding means engaging the levers for holding them normally in active positions, means upon the respective end portions of the carriage for engaging the respective levers when the carriage is brought to the limits of its movement, adjustable connections between the levers, and means under the control of an operator for simultaneously shifting said levers to disengage the carriage.

In testimony that I claim the foregoing as my own, I have hereto atiiXed my signature.

RALPH W. STOCKEMER. 

